Sorry about that Jiri! I've let the rest of the team know and they're taking a look now. 

Thanks for reporting this issue! 

Hi Jiri, 

We were able to fix this issue yesterday morning. Could you please check your account and let me know if you're still seeing duplicates in your feeds? 

Thanks! 

Hi Jiri, 

That's great news - we're glad to have you :)! We took a look, and it seems that our library isn't able to process certain non-valid RSS feeds that other libraries (such as Feedly's) are able to. 

The development team is going to see if they can make our library more tolerant so that they work in our service. I've also contacted Czech Crunch directly to see if they can fix their feed. 

Thanks very much for reporting this to us and we'll do our best to get this figured out.